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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
Presentation Title Phase Diagrams Evaluation for Design of Thermoelectric Materials and Development of Fabrication Processes
Author(s) Yoshisato Kimura, Natsumi Kaneko, Yosuke Kubo, Yong Hoon Lee, Hiroyuki Matsunami, Hirokuni Hachiuma
On-Site Speaker (Planned) Yoshisato Kimura
Abstract Scope Thermoelectric properties are sensitively affected by microstructure which changes according to the phase equilibrium during high temperature fabrication processes and/or applications. Phase diagrams are important not only to improve thermoelectric performance through microstructure control but also to predict long-term stability and reliability. The objective of the present work is to evaluate phase diagrams for improvement of thermoelectric performance and desirable fabrication processes. Ternary phase diagrams were partially evaluated by experiments for alloy systems including Mg<SUB>2</SUB>(Si,Sn) and half-Heusler (Ti,Zr)(Ni,Co)Sn, respectively. It is hard to suppress chemical composition shifts induced by oxidation of Mg (vaporization as well) and Ti at high temperatures even under low oxygen partial pressure. These two compounds equilibrate with the liquid phase down to low temperatures in relatively wide compositional range since the melting point of Sn is extremely low. Reaction scheme, projection of liquidus surface, several isotherms were evaluated and considered for Mg-Si-Sn and Ti-Ni-Sn ternary systems.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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